cam_pos      = [-0.112745, 1.25011, 1.32748]';
cam_dir      = [0.645763, -0.0702356, -0.7603]';
cam_up       = [-0.427152, 0.792126, -0.435979]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.841724, -0.806383, -0.640428]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;